Machines for making backings for artificial teeth



Jan. 12, 1932. 7 DE. EVANS 1,840,839

MACHINE FOR- MAKING A'cKINqs FOR ARTIFICIAL TEETH Filed March 1, 1929 5 Sheets-Sheet l A TTORNE Y.

Jan. 12, 1932. D. E, EVAN 1,840,839

MACHINE FOR MAKING BAGKINGS FOR ARTIFICIAL TEETH Fiied March 1, 1929 5 Sheets-Sheet 2 I N VEN TOR.

ATTORNEY.

By lg oua w 1932- D. E. EVANS 1,340,339

MACHINE FOR MAKING BAGKINGS FOR ARTIFICIAL TEETH Filed March 1, 1929 5 SheetsSheet 5 I N VEN TOR.

A TTORNE Y.

D. E. EVANS Jan. 12, 1932.

MACHINE FOR MAKING BACKINGS FOR ARTIFICIAL TEETH Filed March 1, 1929 5 Sheets-Sheet 5 INVENTOR.

ATTORNEY.

Patented Jan. 12, 1932 P; i /FFiI-QE DAVID "EVANS, F COLUMBUS, OHIG, ASSIGNOR 'IO .T-HE COLUMBUS DENTAL -1V[ANU .FACTURING CQMPANY, OF COLUMBUS OI-IIO, ,A-i CGRPORATION cMAGHINESFOR'MAKIN G.BAGKINGS FOR ARTIFICIAL TEETH Application filedMarch 1, 19559. Serial 3103343,?67.

Artificial: teeth now most commonly :used for" brldge" *work A are what is known as interchangeable'te'e-th that is to say, all teeth are .so accurately nade as to their bearing on. vtit-faces andilockmg grooves and slots that in iliibeemdiflicult to rivet: the backing and post with a joint su'ificiently tight to prevent the solder-, a dentist uses, from seeping through the joint around the rivet onto theface of the back-ingthat'comes into oontact with the 0 enamel tooth. Solder on thisfaceis'extreme- 1 objectionable, from: "many standpoints, the most important of-which isth'at solder on'the inner or porcelain contacting face of-the-bacln ingwhich prevents a close intimate contact between the porcelaineandbacking-through- 3.30.1ain. r

The object of iny invention is to form a rivet joint between tthe backing V and its: post that entirely eliminates the possibility of solder seeping through the oint, :and another object of my invention is toprovidea machine that will accurately position:thebaekingand its post'and rivetrthem together witha solder tight V joint.

tIn thefidraw-ings p I igure 1' is a"front elevation of a backing forming m'achine embodyig any invention.

:FigureQ. isia top planview ofiFigure 1.

' FFigure iS is a sectionalview on the line 3-3 Figure 1.

-Figure4is anenlarged detail view showing'the post clamping jaws in open position.

Figure 5 is'a-similar-view showing the jaws in closed position.

Figure 6 'is'an enlarged detail view of the riveting-punch and associated parts.

Figure 7 is a view similar to Figure 6, parts being in section.

Figure 8 is a bottom plan view of the mechanism shown in Figure 7 j Figure 9 is a rear elevation of a-toothbacking embodying my invention. )0

Figure 10 is an assembly viewof the backing and post.

Figure 11 is a bottom plan view of the rivet former. V

Figure 12 is an enlarged detail-view of the rivetjoint betweenthe backingand post in the line 1212, Figure 9.

Figure 13 is a detailview of the clamp j w r :In the drawings thereference number 13 designatesa swinging base or anvil which is pivotally suitably securedonthe block A.

The base 13 is provided with a fixed jaw 14 secured thereto by means of the set screws 15, 70

which coacts-witha movable jaw 16 pivotally mounted at 17 .on the base 13, as more clearly shown inFigures 3, 1 and 5, thepivot pin 17 being seated inan opening in the base. *The jaws 14 and 16are each provided with a re cess-18 in whichia coiled spring 19 isseated, the spring bridging the joint betweenthe two jaws as more clearly. shown .in Figure 5, whereby the aws are, under certain conditions, opened, or rather the jaw 16 is moved fromthe aw 14 on its pivot 17. p A pin 20 is also seated in ithBSQ'IGCGSSGS 18 and is positioned within the spring 19, the outer end of the pinflbeing firmly seatedin the movable jaw 16, said-pin functioningflnameasure,

as a centering guide for the jaws'l iand 16.

A block-21 is securedto'the base at one end ofthe stationary jaw 14,-by means of one of :the screws 15, integral with which is-anupstanding post 23 having a split upper end witha screw threaded opening at the bottom of the split inwhich opening is mounted a screw threaded adjustable stop or gauging pin 24. The split jaws are adapted tobe clamped by a setscrew 25 afterthe gaugeg; pin Qthas been adjusted thereby locking the pin 24 in its adjusted position against accidental displacement.

This anvil or base 13 is pivotally mounted on the block 'Abymeans of a pin-26which 1:

is locked in position by means of the set screw 27, said block being provided with a stop 28 at its front edge.

'I' he base 13 is provided with a set screw 29 which passes transversely through it at its swinging end, and is adapted to cooperate with the stop 28 on the block A to compensate for wear. An operating handle 30 is pivoted at 31 to the pivoted base 13 and is provided with a cam head 32 which is adapted to engage the movable jaw 16 and move said jaw to and lock it in closed posi ion against the stationary jaw 14. 33 is a stop on the base or anvil 13 which limits the inward movement 01"? the handle 30 and functions as a fulcrum for the handle when the movable jaw is moved to open position, the outward movement of the base 13 being limited by the stop 28 on the block A.

The backing plate 13 is provided with rivet holes C while the post D is provided w th a web E from the edge of which rivets project.

Referring now more specifically to Figures 1, 6, '7, 8 and 11 which show in detai the riveting mechanism, the block A is pro rided with a standard 34 on which a reciprocating head 35 is mounted (see Figure 1), said head being adapted for connection with a suitable actuating mechanism (not shown).

The head is provided with a recess 36 in its lower end in which the stem 37 of the punch assembly is held in any suitable manner.

A plate or head 38 is secured to the bottom of the stem 3? and is provided with a block 38a from the bottom of which extends the riveting swaging elements 386. A pin 380 extends upwardly from the plate 38 and enters a hole in the head 35 to hold the plate 38 and post 37 against rotation. A plate 42 is provided with acentral rectangular opening 43 in which the block 38a reciprocates, this plate 42 being provided with guide pins 43' which have a sliding lit in corresponding bores 44 in the plate 88, and said plates are held together by means of screw bolts, or pins 45 which pins are threaded only on their end portions which engage the plate 42, the plate 38 being free to slide upon the pins. These plates 38 and 42 are provided with recesses 39 in which coiled springs 40 ar secured, which springs normally hold the plates from each other as shown in Figure 6, but permit the plates to close up as shown in Figure 7.

A shutter plate or cap 46 is secured to the under face of the plate 42 by means of screws 47, the plate 46 being provided with an insert 48 of harder etal in which are formed openings 49 through which the riveters 385 are adapted to pass, as shown in Figure 7. The shutter 46 is provided with a punch clearance, or centering depression concave recess 50 around the punch or rivet openings l9.

In operating the machine the parts are moved to the position shown in Figure 3 in which position the movable jaw 16 is moved away from the fixed jaw 14. The post D is then inserted between the jaws and moved until it is stopped by the gauge pin 24, the rivets F projecting above the jaws 14 and 16; the backing B is then fitted on the rivets F. The parts are now moved to the position shown in Figure 2 and the handle 30 pulled outward whereby the cam 32 firmly clamps the jaw 16 against the post D, after which the riveter assembly is moved by power from the position shown in Figure 6 to the position shown in Figure 7 in which position the riveters 386 have swaged the metal of the ends of the posts F beyond the perimeter of the openings C of the backing, as shown in Figures 9 and 12, thereby completely sealing the joint between the rivets and backing against solder. As shown in Figure 7 the swaged metal of the rivets is confined between the walls of the rectangular openings 49 of the plate 46, thereby imparting a symmetrical perimeter to the rivet head and insuring an even thickness of metal throughoutthe head. After this operation the handle 30 is pushed inward and the base with associated parts is swung outward until it strikes the stop 28 and continued movement of the handle is possible until it strikes the stop 33 at which time the movable jaw 16 trees the completed backing to be removed from the machine.

It will be noted that the jaws 14 and 16 never contact because it is necessary that a certain amount of space must be provided to receive the web E of the post.

As shown in Figure 13, the jaws each have a groove 50 to accommodate the post D above which the adjacent faces of the jaws form a slot 51 opening the grooves to the top face of the jaws to receive the web E of the post.

What I claim is:

1. In a device of the kind described a riveter assembly comprising a member having a chamber, a riveter head movably mounted in said chamber, riveters carried by said head, a shutter plate secured to said member and provided with ports to receive said riveters, means to hold an article with its rivets projecting into said ports, whereby the rivet heads are swaged within and take the shape of said ports.

2. In a machine of the kind described, a riveter assembly comprising a base adapted to be mounted on a power head, a plate mounted on said base and having movement toward and from said base, said plate having a chain er therein, means to normally hold the base and plate spaced apart, a head fixed to said base and movable in said chamber in said plate, riveters carried by the head, a shutter plate secured to the first-name plate and having rivet ports, and means to hold an article with its rivets projecting into said ports, whereby the rivet heads are swaged within and take the shape of said ports.

3. In a machine of the kind described, a

riveter assembly comprising a base adapted to be secured to a power head, a plate mounted on said base and having movement toward and from the base, said plate having a chamber therein, sockets in the base and plate, coiled springs mounted in said sockets and holding the base and plate normally in spaced relation, a head fixed to said base and movable'in said chamber irisaid plate, riveters carried by the head, a shutter plate secured to the first-named plate and having rivet ports, and means to hold an article with its rivets projecting into said ports, whereby the rivet headsv are swaged within and take the shape of said ports. I v

4. In a machine of the kind described, a riveter assembly comprising a base adapted to be secured to a power head, means to center the base on a power head, a plate secured to said base and having movement toward and from the base, said plate having a chamber therein, sockets in the base and plate, coiled springs sealed in said sockets and holding the base and plate normally in spaced relation, guides extending between the base and plate to keep them in alinement, a head fixed to said base andmovable in said chamber in said plate, riveters carried by the head,'a shutter plate secured to the first-named plate and having rivet ports and means to hold an article with its rivets projecting into said ports, whereby the rivet heads are swaged within and take the shape of said ports.

In testimony whereof I aflix my'signature.

DAVID E. EVANS. 

